go.talks/present: fix tags nesting in slide.tmpl Also chmod -x slide.tmpl.
go.talks/present: fix tags nesting in slide.tmpl
Also chmod -x slide.tmpl.

Fixes golang/go#4289.

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/6779056

Karthikvb/talks,Karthikvb/talks,Karthikvb/talks,Karthikvb/talks,Karthikvb/talks,Karthikvb/talks